Adding-machine.



R. A. GRABER.

ADDING MACHINE.

APPLICATION FILED DBO. '1, 1910.

Patented Sept. 5, 1911.

2 SHEETS-SHEET 1.

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COLUMNA PLANocl/PH cc.. WASHINGTON. D. c.

R. A. GRABER.

ADDING MACHINE.

APPLICATION FILED DB0. 7. 1910.

Patented Sept. 5, 1911.

2 SHEETS-SHEET 2.

' INVENTOI? w/mfssfs' '56 r M MV I 1 *MM QM Ano/Mfrs wUNTTEI) STATESPATENT OFFICE.

ROBERT ALBERT GRABER, OF NEW YORK, N. Y.

ADDING-MACHINE.

To all whom 'it may concern.'

Beit known that I, ROBERT ALBERT GRA- BER, a citizen of the UnitedStates, residing at New York city, borough of the Bronx,

county of New York, and State of New ever, is automatically uncoupledfrom the tens and hundreds disks, while they are returned to their zeroposition. The machine is compact, of simple construction and may bereadily manipulated.

In the accompanying drawing: Figure 1 is a perspective view of myimproved adding machine; Fig. 2 a horizontal section on line 2 2, Fig.1; Fig. 3 a cross section on line 3-3, Fig. 2; Fig. 4 a horizontalsection on line 5-5, Fig. 5; Fig. 5a sectional rear view of the machine;Fig. 6 an enlarged cross section on line 6 6, Fig. 2, and Fig. 7 adetail of the dog and adjoining parts.

From the bottom plate 10 of a suitable casing 11 rises a vertical pin 12upon which is freely rotatable the sleeve or hub 13 of the units dial14. The latter is provided with the digits 0 to 9, the rear digit beingdisplayed through a window 15 of casing 11. To sleeve 13 is secured apinion 16 having 10 teeth which mesh into a toothed wheel 17 turning ona fixed stud 18 of bottom 10. Upon stud 18 is also free to turn an elbowlever, one arm 19 of which is influenced by a spring 2O tending torotate the arm in the direction of arrow 21 (Fig. 4). The other arm 22of the elbow lever is provided with a curved spring pawl 23, the freeend of which enters the teeth of wheel 17 and is adapted to rotate thelatter in the direction of arrow 21. During the receding movement ofspring pawl 23, a spring-detent 24 maintains gear wheel 17 in theposition to which it has previously been set. Against arm 19 impingesthe bent end of a rod or Specification of Letters Patent.

Application filed December 7, 1910.

Patented Sept. 5, 1911.

serial No. 596,000.

finger 25 depending from and secured to a longitudinal shaft 26 thatturns in bearings 27 of plate 10. It will thus be seen that when shaft26 is turned in the direction of the arrow (Figs. 2 and 3) lever 25 willpartially rotate wheel 17 through double lever 19, 22 and pawl 23thereby tightening spring 20, while upon the return of said shaft,spring 20 will unwind to return lever 19, 22 to its original position,wheel 17, however, being held against return by detent 24.

To shaft 26 are secured by screws 28, nine tappets 29 separated fromeach other by spacing tubes 30. Each tappet 29 is provided with ac-entral slot 31 accommodating the eye 32 of a key lever 33, said eyeloosely encircling shaft 26. Levers 33 pass through vert-ical slots 34of casing 11 and carry finger pieces 35 numbered from 1 to 9. Springs 36tend to raise levers 33 into engagement with the upper ends of slots 34,while a longitudinal bar 37 limits the downstroke of the levers. Tappets29 are set at different angles to their respective key levers 33, thetappet 29 of the key lever numbered 9 being so arranged that its forwardend contacts with such lever (Fig. 3), while the angle between tappetsand levers increases gradually toward the left. In this way the keylevers swing idly through a greater or less arc before they abut againsttheir tappets to take them along during the continued descent, therebyturning shaft 26 through a smaller or greater angle. The actualproportions are such that when, for instance key lever l is depressed,its tappet 29 will rotate shaft 26 through such an angle that pawl 23advances wheel 17 for one tooth, while when key lever 2 is depressed,wheel 17 is advanced for two. teeth, and so on.

Upon sleeve 13 is mounted a disk 38 having a pin 39 which is adapted toengage the teeth of a pinion 40 having ten teeth. At the lower' portionof the pinion and opposite disk 38, five alternating teeth are cut awayas illustrated in Fig. 5, so that the rotating disk 38 by engaging apair of adjoining uncut teeth, locks pinion 40 in position, the wholeconstitutingaGeneva movement (Fig. 4). Flanking pin 39, disk 38 has anotch 41 that permits the passage of one of the uncut teeth of pinion 40when the latter is partially rotated by pin 39. The upper unmutilatedportion of pinion 40 meshes with a toothed wheel 42 having twenty teethand fast on the hub 43 of a dial 44, which is provided with the digits Oto 9. Hub 43 carries a disk 45 having' a pin 4G which is adapted toengage a partly mutilated pinion 47, the parts 45, 4G and 47 being inall respect-s duplicates of the parts 38, 39, 40. linion 47 engages atoothed wheel 48 having twenty teeth and fast on the hub 49 of a dial 50which is also provided with the digits Oto 9.

As thus far described, the manipulation is as follows: If a column offigures containing any number of digits is to be added, all the unitsare first added by depressing the corresponding iinger pieces 35. So forinstance a depression of key 9 will advance wheel 17 for nine teeth andconsequently the intergeared dial 14 for nine digits. Upon the releaseof the key, the latter will be raised by spring 3G, while elbow lever19, 22 will be returned by spring 20. During this return movement of theparts 36, 19, 22, wheel 17 will be retained in its position by detent24, so that dial 14 will be maintained in the position to which it hasbeen set. During the consecutive depression of finger pieces 35, the sumof the corresponding digits will, be registered by dials 14, 44, 50, thecarrying of the tens and hundreds being effected by the pins 39, 46 andcoperating parts, as will be readily understood. After all the unitshave thus been added, the digit of dial 14 displayed through window 15is noted, and the tens and hundreds are also noted. Dials 44, 50 are nowreturned to their zero position, while dial 14 remains at the positionto which it has been set, as hereinafter more fully described. Thecomplement number is now added to the remaining digit of dial 14 bydepressing corresponding finger' pieces 35 so as to display the digit ordigits of the gure to be. carried, whereupon the operation is repeatedfor adding the digits of the tens-column, etc. Thus if for instance thesum of the numbers 997, 458, 759, 898 is to be computed the digits ofthe numbers are first added by consecutively depressing the keys 7 8, 98 to display the sum of 32 through two right hand windows 15. Thenumeral 2 is noted as constituting the digit of the sum, whereupon thetens-dial is returned to its Zero position, while the digit 2 remainsexposed. As 3 is to be carried the key 1 is depressed thereby changing 2previously displayed through right hand window 15 into 3 The tens of thenumbers are now added to the three already displayed by consecutivelydepress ing keys 9 5 5 9 to display the sum of 31 through the two righthand windows 15, whereupon 1 is placed in front of the digit 2previously ascertained. The tens dial is now again returned to its Zeroposition while the numeral l remains displayed, but as 3 is to becarried, key 2 is depressed, whereupon the keys 9 4, 7, 8 areconsecutively depressed to compute the sum of the hundreds. In this way31 will be displayed, which sum is written in front of the number 12previously ascertained, thereby bringing the total up to 3112, whichrepresents the desired sum.

rEhe means for returning dials 44, 50 to their zero position are asfollows: The hub 49 of dial 50 is provided with a ixed pinion 51 havingten teeth meshing into a sector 52 having nine teeth of normal crosssection and a pair of comparatively wide flanking teeth 53 which cannotenter the recesses bctween the teeth of pinion 51 and thus constitutestops therefor. Upon the bottom 10 is supported a T-shaped slide movableat right angles to the axes of dials 44, 50, the cross bar 54 of saidslide being provided with parallel bevels guided between fixed pins 56.The stem 57 of the slide` is forked as at 58 for the reception of astationary pin 59. A spring GO engaging an abutment (31 of stem 57 tendsto draw the latter against a fixed stop G2. Bar 54 carries a pair ofstuds G3 that constitute the fulcrums for pinions 40 and 47. V or movingslide 54, 57, a handle G4 is pivoted to plate 10 as at G5 and isprovided with a tail 56. This tail engages a )in G7 of a two arm lever(38, G9 pivoted at to plate 10. Lever G8, G9 is normally held in theposition indicated in Fig. 4 by a spring 71 coiled around pivot 70. A rm59 carries a pin 72 provided with an antifriction roller 73 which isadapted to engage a cam 74 secured to sector To the lower side of leverarm 68 is secured a resilient member 75 carrying an upper knob 7G and alower pin 77 which latter is adapted to engage the curved back 78 of adog 79 pivoted at 80 and having a {inger 81 as well as an interveningrecess 82, the dog being beveled as at 83 for a purpose hereinafterdescribed. Into recess 82 extends a laterally projecting arm 84 of stem57 that returns the dog after operation to its original position. Knob7G is adapted to engage a cordate cam 85 mounted on the hub 43 of dial44. If it is desired to return dials 44, 50 to their zero position,handle G4 is swung forward, to tilt backward through tail G3 and pin 77the arm 68 of lever 68, G9. The receding pin 77 of arm G8 while ridingalong the back 78 of dog 79 will tilt the latter whereby slide 54, 57 isshifted backward owing to the engagement of finger 81 with arm 84. Inthis way the studs G3 of pinions 40 and 47 are moved rearward and to theleft so as to withdraw said pinions from disks 38, 45 while they remainin engagement with toothed wheels 42, 48 respectively. During thecontinued rearward motion of arm 68, knob 7 6 engages cam 85 and therebyturns dial 44 until its Zero number appears below window l5.Simultaneously therewith roller 7 2 has been swung forward to engage cam74 and thus return dial 50 to its zero position. Immediately beforehandle 64 and lever 68, 69 reach their terminal position, pin 77 slipsoff dog 79 so to permit spring 60 to return slide 54, 57 to its initialposition and recouple pinions 40, 47 with their respective disks. Afterhandle 64 has been released by the operator, spring 7l returns lever 68,69 and handle G4 to their original position during which movement theresiliency of member 7 5 permits pin 77 to ride over the incline 83 ofdog 79 until it engages the back 78 of dog 79. The machine is thus readyfor the next operation.

I claim:

l. An adding machine comprising a shaft, slotted tappets secured theretoat different angles, spring-iniiuenced key levers loosely mounted on theshaft and accommodated by the tappet-slots, said levers being adapted toengage the tappets, and 'a registering device operatively connected tothe shaft.

2. An adding machine comprising a pair of pinions alternating teeth ofwhich are partly mutilated, toothed wheels engaged by the unmutilatedpinion-sections, notched disks adapted to be engaged by the mutilatedpinion sections, and means for withdrawing the pinions from the diskswhile maintaining their engagement with the toothed wheels.

3. An adding machine comprising a pair of rotatable hubs, dials andtoothed wheels secured thereto, a first cam on one of said hubs, asecond cam intergeared with the other hub, pinions engaging the toothedwheels, a slide carrying the pinions, a two arm lever adapted to engageboth cams, and means for simultaneously reciprocating the slide andoscillating the lever.

4. An adding machine comprising a pair of rotatable hubs, dials andtoothed wheels secured thereto, a first cam on one of said hubs, asecond cam intergeared with the other hub, pinions engaging the toothedwheels, a slide carrying the pinions, a twoarm lever, a knob on one armof said lever adapted to engage the first cam, a pin on the otherlever-arm adapted to engage the second cam, and means for simultaneouslyreciprocating the slide and oscillating the lever.

5. An adding machine comprising a pair of rotatable hubs, dials andtoothed wheels secured thereto, a first cam on one of said hubs, asecond cam intergeared with the other hub, pinions engaging the toothedwheels, a spring-influenced T-shaped slide having a beveled cross barand a forked stem, yfixed pins engaging the cross barbevels and thestem, an arm on said stem, a recessed pivoted dog engaged by said arm, atwo arm lever adapted to en gage said first and second cams and the dog,and a handle operatively connected to said lever.

6. An adding machine comprising a pair of dials, toothed wheels securedthereto, pinions adapted to engage said wheels, a springinfluencedT-shaped slide composed of a pinion-carrying cross bar and of a stem,means for guiding said slide, an -arm projecting laterally from thestem, a pivoted beveled dog having a recess that is engaged by said arm,a two-arm lever, a resilient member on one arm of said lever, a pincarried by said member which is adapted to engage the beveled dog, and ahandle operatively connected to said lever.

7. An adding machine comprising a pair of pinions alternating teeth ofwhich are partly mutilated, toothed wheels engaged by the unmutilatedpinion-sections, notched disks adapted to be engaged by the mutilatedpinion-sections, a slide carrying the pinions, and means for so movingsaid slide as to withdraw the pinions from the disks, while maintainingtheir engagement with the toothed wheels.

8. An adding machine comprising a pair of partly mutilated pinions,toothed wheels engaged by the unmutilated pinion-sections, notched disksadapted to be engaged by the mutilated pinion sections, a T-shaped slidecarrying the pinions and having parallel bevels, stationary pins engagedby the bevels, and means for advancing the slide, whereby the pinionsare withdrawn from the disks while maintaining their engagement with thetoothed wheels.

ROBERT ALBERT GRABER.

lVitnesses 'ARTHUR E. ZUMPE, KATHERYNE KOCH.

Copies of this patent may be obtained for iive cents each, by addressingthe Commissioner of Patents, Washington, D. C.

